/*
 * To change this template, choose Tools | Templates
 * and open the template in the editor.
 */
package servlet;

import java.io.IOException;
import java.io.PrintWriter;
import java.util.Iterator;
import java.util.List;
import java.util.logging.Level;
import java.util.logging.Logger;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import model.BuildNameNotSetException;
import model.InvalidTSException;
import model.VMMachine;
import model.VMMachineFactory;
import model.VMNotReadyException;

/**
 *
 * @author dongxu
 */
public class VMStateServlet extends HttpServlet {

    /** 
     * Processes requests for both HTTP <code>GET</code> and <code>POST</code> methods.
     * @param request servlet request
     * @param response servlet response
     * @throws ServletException if a servlet-specific error occurs
     * @throws IOException if an I/O error occurs
     */
    protected void processRequest(HttpServletRequest request, HttpServletResponse response)
            throws ServletException, IOException {
        response.setContentType("text/html;charset=UTF-8");
        PrintWriter out = response.getWriter();
        try {
            /* TODO output your page here
            out.println("<html>");
            out.println("<head>");
            out.println("<title>Servlet VMStateServlet</title>");  
            out.println("</head>");
            out.println("<body>");
            out.println("<h1>Servlet VMStateServlet at " + request.getContextPath () + "</h1>");
            out.println("</body>");
            out.println("</html>");
             */
        } finally {
            out.close();
        }
    }

    // <editor-fold defaultstate="collapsed" desc="HttpServlet methods. Click on the + sign on the left to edit the code.">
    /** 
     * Handles the HTTP <code>GET</code> method.
     * @param request servlet request
     * @param response servlet response
     * @throws ServletException if a servlet-specific error occurs
     * @throws IOException if an I/O error occurs
     */
    @Override
    protected void doGet(HttpServletRequest request, HttpServletResponse response)
            throws ServletException, IOException {

        List machines = VMMachineFactory.getVMMachines();
        Iterator it = machines.iterator();
        while (it.hasNext()) {
            VMMachine machine = (VMMachine) it.next();
            renderMachine(machine, response);

        }
    }

    private void renderMachine(VMMachine machine, HttpServletResponse response) {
        try {
            boolean hostingMachineRunning = machine.isHostingMachineReady();
            boolean vmReady = machine.hasCurrentBuildSnapshot();
            if (hostingMachineRunning && vmReady) {
                response.getWriter().print(machine.getName() + "is OK.<br>");
            }
            if (!hostingMachineRunning) {
                response.getWriter().print("hosting machine for " + machine.getName() + " is down<br>");
            }
            if (hostingMachineRunning && !vmReady) {
                response.getWriter().print(machine.getName() + " is not setup<br>");
            }
        } catch (BuildNameNotSetException e) {
            try {
                response.getWriter().print(e.getMessage()+"<br>");
            } catch (IOException ex) {
                Logger.getLogger(VMStateServlet.class.getName()).log(Level.SEVERE, null, ex);
            }
        } catch (IOException e) {
        }
    }

    /** 
     * Handles the HTTP <code>POST</code> method.
     * @param request servlet request
     * @param response servlet response
     * @throws ServletException if a servlet-specific error occurs
     * @throws IOException if an I/O error occurs
     */
    @Override
    protected void doPost(HttpServletRequest request, HttpServletResponse response)
            throws ServletException, IOException {
        processRequest(request, response);
    }

    /** 
     * Returns a short description of the servlet.
     * @return a String containing servlet description
     */
    @Override
    public String getServletInfo() {
        return "Short description";
    }// </editor-fold>
}
